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ST. LOUIS (KMOX) – Have you heard about the Heartbleed Bug? You won’t find it crawling in your garden.

Instead, it’s been crawling through practically every computer website for many months now.

“80 or 90 percent of all websites were affected by this,” says Vinny Troia, a certified ethical hacker with Night Lion Security in Ballwin.

The Heartbleed Bug breached encryption technology—that little padlock you see when you log onto a secure website.

“We do know that there are some sites that have been majorly affected, such as Yahoo Mail,” he says. “So, potentially anyone who has logged into Yahoo Mail while this vulnerability was being exploited could have had their passwords compromised. So, regardless of whether you’re using Yahoo Mail, Google Mail, or anything like that, I would go ahead and change your passwords at this point.”

And immediately report any fraudulent activity you might see on your credit card statements.